Feature Request: Filter sessions by working directory (pwd)

Problem

When resuming chat sessions with --resume or /resume, all conversations are shown globally. In multi-project environments, this creates cognitive load and makes it hard to find project-specific sessions.

Expected Behavior

Option to view only chat sessions that were started in the current working directory (or project root where CLAUDE.md exists).

Proposed Solutions

1. Add --local or --project-only flag to --resume
2. Add filter option in interactive session picker
3. Store and respect pwd context when storing sessions

Use Case

Developer working across multiple projects:

cd /project/securify-app
claude --resume --local  # Shows only sessions from this directory

cd /project/other-app
claude --resume --local  # Shows only sessions from other-app

Current Behavior

• Sessions are stored globally
• pwd is not captured or used for filtering
• No way to quickly find project-relevant sessions

Additional Context

Sessions already preserve conversation history and tool state. Could extend to preserve and filter by pwd.